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通过空间限制合成的超细纳米粒子Rh/CeO₂-ZrO₂催化剂:与Rh单原子催化剂相比,三路催化活性更高

Dongming Chen^1,2,3, Zihao Xu^1,2,3, Ziteng Mao^1,2,3

¹National Engineering Research Center for Rare Earth, Grirem Advanced Materials Co., Ltd., Beijing 100088, China.

ACS applied materials & interfaces

|February 20, 2025

概括

使用空间限制合成的超细Rh纳米颗粒在三向催化中表现出优异的性能,与单原子催化剂相比. 这种纳米粒子催化剂 (NPC) 提供了增强的稳定性和活性,特别是在氧化的存在下.

科学领域:

催化剂是一种催化剂.
材料科学材料科学材料科学
化学工程是化学工程的重要组成部分.

背景情况:

控制尺寸的超细金属基催化剂对于有效的化学转化至关重要.
Rh/CeO2-ZrO2催化剂对于三向催化应用非常重要.

研究的目的:

在CeO2-ZrO2.2.上研制超细Rh纳米颗粒的空间封闭策略.
为了比较Rh纳米粒子催化剂 (NPC) 与Rh单原子催化剂 (SAC) 在三向反应中的催化性能和稳定性.

主要方法:

使用静电吸附和中孔阻碍的空间限制策略.
用超细Rh纳米粒子 (1-3nm) 合成Rh/CeO2-ZrO2催化剂.
在CO,HC和NO的气体混合物中以及在热水老化下对催化性能的评估.

主要成果:

一个纳米粒子催化剂 (NPC) 含有~2.19纳米的Rh纳米粒子表现出高的催化性能,性能优于SAC和其他NPC.
在没有NO的情况下,Rh SAC显示出更高的CO氧化活性,但其性能受到NO的阻碍.
Rh NPC在三向反应中表现出较弱的NO影响和增强的低温活性,以及更好的稳定性.

结论:

空间限制是合成超细Rh纳米粒子用于催化的一个有效策略.
在三向催化中,Rh纳米粒子比SAC具有优势,特别是在现实的废气条件下与NO.
开发的NPC表现出用于汽车排放控制的卓越活动和稳定性.

关键词:

一个Rh单原子.在Rh/CeO2−ZrO2催化剂中.空间限制的局限性三路催化活动的三路催化活动.超细的Rh纳米颗粒.

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